This is my Case. It's really good. I don't like using the phone on it's own as it keeps slipping out of my grip.
How much was your shipping?
0.99 pence. The grip is great and the two pieces snap together well and so far look as if they'll keep doing so. Trying new ROMs requires access to the battery a lot :)
It's the best case I've found so far. I've purchased quite a few different ones, and that's my case of choice. These type for instance:
They have a good grip, but even though there's a hole cut for the USB connection, you can't actually plug in a cable without either cutting the case further, or removing the cover. The cover itself doesn't come up over the front of the Sensation, so if you have a habit of facing it lying down or drop it, there's a good chance that the front bevel will be scratched.
I've bought a few Window-screen mount-holders too, and most of the Sensation specific ones won't allow you to put in your phone, while it's still in its cover. So, if you want one of those, I'd suggest you look for the Generic ones.